Wettability of heated surfaces under pool boiling using surfactant solutions and nano-fluids

2008 ◽  
Vol 51 (11-12) ◽  
pp. 3025-3031 ◽  
Author(s):  
Yong Hoon Jeong ◽  
Won Joon Chang ◽  
Soon Heung Chang
Keyword(s):  
Pool Boiling ◽  
Surfactant Solutions ◽  
Nano Fluids

Pool boiling of nano-fluids on horizontal narrow tubes

2003 ◽  
Vol 29 (8) ◽  
pp. 1237-1247 ◽  
Author(s):  
Sarit K. Das ◽  
Nandy Putra ◽  
Wilfried Roetzel
Keyword(s):  
Pool Boiling ◽  
Nano Fluids

Visualization Study of Pool Boiling on Polished and Porous Coated Surfaces for Deionized Water and Al2O3-Water Nano-Fluids

2013 ◽  
Author(s):  
Gengwen Niu ◽  
Ji Li
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Transfer Performance ◽  
Pool Boiling ◽  
Porous Coating ◽  
Polished Surface ◽  
Transfer Performance ◽  
Working Medium ◽  
The Heat Transfer Coefficient ◽  
Nano Fluids

In the present work, pool boiling on copper porous coating and polished surface are studied experimentally at atmospheric pressure to explore the characteristics and the regime of boiling. A high-speed camera (maximum frame rate 10000 fps) with attached magnifying lens allowed precise observation of the incipient nucleation of boiling on the two surfaces. The observed boiling phenomena suggest different characteristics in the wall superheat, the heat transfer coefficient, the departure diameter of the bubble and the frequency of the bubble generation on two substrates for two working medium at different input power. The results indicate that the heat transfer performance is greatly enhanced by using porous coating and nano-fluids. The heat transfer coefficient on the porous coating is three to four times of that on the polished surface. Meanwhile, the temperature at incipience of boiling on the porous coating is lower than that on the polished surface qualitatively for the same working medium. The new contribution of this work is that we combined nano-fluids and porous surface together to explore the heat transfer performance and conducted visual experiments to observe the behavior of the bubbles of this assembly in the pool boiling.

Effect of nanoparticles on CHF enhancement in pool boiling of nano-fluids

2006 ◽  
Vol 49 (25-26) ◽  
pp. 5070-5074 ◽  
Author(s):  
Hyungdae Kim ◽  
Jeongbae Kim ◽  
Moo Hwan Kim
Keyword(s):  
Pool Boiling ◽  
Nano Fluids

Comparisons of Aqueous Surfactant Solutions for Nucleate Pool Boiling

2016 ◽  
Author(s):  
Birce Dikici ◽  
Basim Q. A. Al-Sukaini
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Pure Water ◽  
Pool Boiling ◽  
Lauryl Sulfate ◽  
Nucleate Pool Boiling ◽  
Transfer Enhancement ◽  
Surfactant Solutions ◽  
Boiling Heat Transfer Coefficient ◽  
Important Possibility

In this study, nucleate pool boiling of surfactant solutions are investigated. The surfactants chosen for the study are an ionic sodium lauryl sulfate (SLS), nonionic ECOSURF™ EH-14, and nonionic ECOSURF™ SA-9. It is observed that adding a small amount of surfactant alters the water boiling phenomenon considerably. Boiling curves for different concentrations are shifted to the left. The wall temperature dropped with an increase in the concentration of aqueous surfactant solutions. Also, it is found that the boiling heat transfer enhancement of SLS is higher than that of EH-14 and SA-9 compared to water. Boiling heat transfer coefficient (h) enhancements compared to water are 46%, 30%, and 21%. (for SLS, for EH-14 and for SA-9 respectively) Boiling visualization shows that boiling with surfactant solutions compared with that in pure water is more vigorous. Bubbles are smaller, activate continuously, and collapse quickly. Also, the bubble departure frequency is observed to be higher than that of pure water. Results prove that there is an important possibility to enhance the boiling application processes by environmentally friendly EH-14, and SA-9 additives. Experimentation can be extended for searching other surfactants in order to find their most efficient quantity in water for boiling heat transfer.

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